OVP transceivers with wide common-mode ranges require double fold-back current limiting within the driver stage. The above diagram shows the current limiting function of the ISL3245xE family of OVP transceivers that operate over a ±20 V common-mode range. Here the first fold-back current level of 63 mA ensures that the driver never folds back when driving loads within the 40 V common-mode range. The very low second fold-back current setting of 13 mA minimizes power dissipation if the driver is enabled when a fault occurs. This current limiting scheme ensures that the output current never exceeds the RS-485 specification, even at the extremes of the common-mode and fault condition voltage range.